/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/XRRenderBridge.h
Override this method in case the render bridge needs access to the current viewport or RHI viewport before rendering the current frame. Note that youshould notcall Viewport->SetCustomPresent() from this method, as that is handled by the XRRenderTargetManager implementation.
virtual void UpdateViewport ( const class [FViewport](API\Runtime\Engine\FViewport) & Viewport, class [FRHIViewport](API\Runtime\RHI\FRHIViewport) * InViewportRHI )